Lemon Juice works wonderful for removing dark spots since it is a natural bleaching agent and has natural acid in the lemon juice.
To remove dark spots using lemon juice just take a cotton ball and squeeze some lemon juice from a lemon onto the cotton ball and then apply the cotton ball soaked with lemon juice to the dark spots on your face.
Apply the lemon juice twice per day and you should see the dark spots go away within a week or two.